Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a2a747540f4a38…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 16:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f99f84b950ec994a9eb827ccd26a380b SHA-1: 7b842eac86bcc8935630e0726ca124f08611232e SHA-256: f6a2a747540f4a3823275cce7706959a9109cf6486f912f33419ec4466c8de51
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=game+online+pc+seru PDF link annotation
    • http://mariondhuique-mayer.com/data/file/37770042160.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/natilutujafukeka.pdfIn PDF document text
    • https://salwangurugram.com/files/buzelowiropixaniponizalo.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/dusetoxunezo.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wevezejiwovozuwozugoz.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d739b59b62128a1cf385a68c69e39a4c/pezukusurutes.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f75075071---65111367788.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/15972857414.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/69653895014.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210916185740.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/febojovizaxifanesatesemut.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/jebagumaruginoluruveko.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/5129342535.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/jefatuvakasajakaba.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/99728334162.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210920_C433F093C0DD35A0.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/fajaduvutoluwajazudo.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109131109078665.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6bdeec9d4307c4cb05d80b010cf700df/tuxemukupiwekenin.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/16721192465.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/gatutisotanawu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6b259b2466195284fed53bef972f7cea/25612258842.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/wegekubi.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/pilejonejedojip.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/riranalesalube.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D6 16608 bytes
SHA-256: ced89eabece7e3ea38b706595a43079fb9b93df3e3a91203972c40e8982c9fa7
font_01_sfnt_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10576 bytes
SHA-256: 0d8827a704294142bec976a3ce0229cdb61b404c0c675ab5805685247cf78270
font_02_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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